Ответы на вопрос:
1)x+3.4=160.2-100.72
x+3.4=59.48
x=59.48-3.4
x=56.08
2)x-2.4=62.5: 0.25
x-2.4=250
x=250+2.4
x=252.4
3)x+3.07=20.25: 4.5
x+3.07=4.5
x=4.5-3.07
x=1.43
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